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Developer-C 11.1
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4.0
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CREATE TABLE parts(part# INT, replpart INT);
INSERT INTO parts VALUES (1111, 2222), (2222, 3333), (3333, 4444), (5555, 6666), (5555, 7777), (5555, 8888), (7777, 9999);
CREATE INDEX parts_idx_part# ON parts(part#);
WITH cte(part) AS (SELECT replpart FROM parts WHERE part# = 1111 UNION ALL SELECT parts.replpart FROM parts, cte WHERE parts.part# = cte.part) SELECT DISTINCT part FROM cte WHERE part NOT IN (SELECT part# FROM parts);
PART
4444
WITH cte(part) AS (SELECT replpart FROM parts WHERE part# = 5555 UNION ALL SELECT parts.replpart FROM parts, cte WHERE parts.part# = cte.part) SELECT DISTINCT part FROM cte WHERE part NOT IN (SELECT part# FROM parts);
PART
6666
8888
9999